2024年2月1日 · Diastolic heart sounds include the 2 nd, 3 rd, and 4 th heart sounds (S, and S), as well as knocks and snaps. Let's take a closer look at each: is a high-pitched sound caused by the closing of the mitral and tricuspid valves just after the beginning of systole. Mitral valve closure occurs first and is the louder component of S.

In a healthy adult, the heart makes two sounds, commonly described as ‘lub’ and ‘dub.’. The third and fourth sounds may be heard in some healthy people, but can indicate impairment of the heart function. S1 and S2 are high-pitched and S3 and S4 are low-pitched sounds.

An S3 heart sound is best heard with the bell-side of the stethoscope (used for lower frequency sounds). A left-sided S3 is best heard in the left lateral decubitus position and at the apex of the heart, which is normally located in the 5th left intercostal space at the midclavicular line.

2023年7月8日 · The sacral plexus begins as the anterior fibres of the spinal nerves S1, S2, S3, and S4. They are joined by the 4th and 5th lumbar roots, which combine to form the lumbosacral trunk . This descends into the pelvis to meet the sacral roots as they emerge from the spinal cord.

2020年2月24日 · S1/S3 在 windows 中都叫「待命 or standby」，所以在 BIOS 里会有一个选项，设定说 Standby mode 为何，是要 S1 还是 S3，所以啦。S1 和 S3 是不能同时存在的。不是 S1,S4,S5 就是 S3,S4,S5 。 待机、休眠、睡眠的区别和优缺点. Vista下推荐使用睡眠。

2024年6月20日 · 例如，在某些计算机上，主板上的某些芯片可能会在 s3 时断电，而其他一些芯片会保持电源，直到进入 s4 状态。 此外，某些设备只能从 S1 唤醒系统，而不能从更深的睡眠状态唤醒系统。

The fourth heart sound (S4), when audible, is caused by the vibration of the ventricular wall during atrial contraction. This sound is usually associated with a stiffened ventricle (low ventricular compliance), and therefore is present in patients with ventricular hypertrophy, myocardial ischemia, or in older adults.

2023年7月17日 · Variations in S1 and S2 intensity or character can be suggestive of a pathologic lesion but can also be physiological. Diastolic Sounds. Examples of diastolic murmurs are aortic and pulmonic valve regurgitation (AR & PR), tricuspid and mitral valve stenosis (TS & MS), S3 sounds, and S4 sounds.

S3 and S4 are low-frequency diastolic sounds that originate in the ventricles. S3 occurs at the beginning of diastole after S2, is lower in pitch than S1 or S2, is not of valvular origin, and is thought to be caused by the oscillation of blood back and forth between the walls of the ventricles initiated by blood rushing in from the atria.

S0 对应的是正常的开机状态，如果到 S5 这个级别，就直接关机了。 中间的 S1、S2、S3 和 S4 则被划为不同的待机状态。 如果要说的更加细致一点，那么 S1 对应的是 CPU 停止工作但仍然接通电源的状态。 相当于人闭上眼睛，把脑袋逐渐放空。 S2 对应的是 CPU 关闭并断开电源，但像蓝牙这样的周边设备依旧保持运行的状态。 可以看成是人将要入睡，却一直在床上辗转反侧，在睡和不睡的边缘反复试探。 而 S3 则是把 CPU 在内的所有设备断开电源，只有内存兢兢业业保 …